Decomposition of algal lipids in clay-enriched marine sediment under oxic and anoxic conditions

IOCAS-IR

	Decomposition of algal lipids in clay-enriched marine sediment under oxic and anoxic conditions
	Lv DW(吕冬伟); Song Q(宋茜); Wang XC(王旭晨)
发表期刊	Chinese Journal of Oceanology and Limnology
ISSN	0254-4059
	2010-02-15
出版年	2010
卷号	v.28 期号:01 页码:133-145
文献类型	CNKI期刊论文
摘要	A series of laboratory incubation experiments were conducted to examine the decomposition of algal organic matter in clay-enriched marine sediment under oxic and anoxic conditions.During the 245-day incubation period,changes in the concentrations of TOC,major algal fatty acid components (14:0,16:0,16:1,18:1 and 20:5),and n-alkanes (C16-C23) were quantified in the samples.Our results indicate that the organic matters were degraded more rapidly in oxic than anoxic conditions.Adsorption of fatty acids onto clay minerals was a rapid and reversible process.Using a simple G model,we calculated the decomposition rate constants for TOC,n-alkanes and fatty acids which ranged from 0.017-0.024 d-1,0.049-0.103 d-1 and 0.011 to 0.069 d-1,respectively.Algal organic matter degraded in two stages characterized by a fast and a slow degradation processes.The addition of clay minerals montmorillonite and kaolinite to the sediments showed significant influence affecting the decomposition processes of algal TOC and fatty acids by adsorption and incorporation of the compounds with clay particles.Adsorption/association of fatty acids by clay minerals was rapid but appeared to be a slow reversible process.In addition to the sediment redox and clay influence,the structure of the compounds also played important roles in affecting their degradation dynamic in sediments.
关键词	algal organic matter decomposition marine sediments clay minerals
CNKI专辑号	A;B;
CNKI专辑名称	基础科学;工程科技Ⅰ辑;
CNKI专题号	B027;
CNKI专题名称	环境科学与资源利用;
分类号	X703
收录类别	中科院核心
语种	英文;
资助项目(基金）	Supported by the National Natural Science Foundation of China (Nos. 40476038 and 40576039)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/192253
专题	中国科学院海洋研究所
作者单位	1.MarineBiogeochemistryLaboratory,InstituteofOceanology,ChineseAcademyofSciences 2.GraduateSchoolofChineseAcademyofSciences 3.Collegeoffoodandwine,ChinaAgricultureUniversity(Yantai) 4.MarineBiogeochemistryLaboratory,InstituteofOceanology 5.DepartmentofEnvironmental,EarthandOceanSciences,UniversityofMassachusettsBoston
推荐引用方式 GB/T 7714	Lv DW,Song Q,Wang XC. Decomposition of algal lipids in clay-enriched marine sediment under oxic and anoxic conditions. 2010.